There’s a trend across both college and professional football where teams have multiple uniform options for both home and away games. At Oregon and Maryland, the teams wear different uniforms almost every game. The NFL has a more structured approach, where teams have to have any uniform change or nuance approved by the league.
Every NFL team has several uniform looks these days – a home option, and away option and a “color rush” uniform worn at least once a year. Some teams have chosen to go with more options that that, however.
Over the years, the New York Giants have changed their uniforms ever-so-slightly to keep them in vogue.